What can i do if my laptop having a no display

itz may b caused frm many internal hardware cause, like the battery(main/cmos); ram; sm section of the system board; ccfl; inverter circuit; or even the lcd....

howevr, before proceeding to complex test to verify the current status of ur laptop, at 1st all u need is to put on the laptop to charge for atleast 4hrs..(the gauge status may show u a pseudo process)..
if u r a professional, remove the ram(s) from itz slot(s), gently rub itz connector teeth using a rubber to remove carbon or oxide formed if any..
connect it to a external monitor n see if display is coming..
check the internal system battery to b above +3v..

so itz always better to hv supervision..frm ur system admin/vendor/good or authorised service center....

First you need to test if the problem is hardware or software: try to enter the BIOS by pressing on F1, F2 or Escape. If you can't then it's a hardware fail, take it to a shop. If you can then in the boot order put the CD first. Next download and burn a Linux Live-CD like   PCLinuxOS - http://www.pclinuxos.com/ - and boot from it.
If the screen is black, again go in the BIOS and check that the local screen isn't disabled. If it isn't then it's a hardware problem.
If in the Linux disk all is OK then it's a software problem: connect your laptop to another monitor and boot into windows; right click on the desktop, click Properties and in Settings input the correct resolutions and, for the one on the laptop, select the Primary option.